Improved friction-pulley



UNITED STATES PATENT OFFICE.

L. G. MASON, OF WORCESTER, ASSIGNOR TO HIMSELF AND S. S. BARBER, OFFITOHBURG, MASSACHUSETTS.

IMPROVED FRICTION-PULLEY.

Specification forming part of Letters Patent No. 57.352. dated August21, 1866.

To all whom 'it may concern:

Be it known that I, L. G. MASON, of the city and county of Worcester,and Commonwealth of Massachusetts, have invented certain new and usefulImprovements in Friction- Pulleys; and I do hereby declare that thefollowing is a full, clear, and exact description of the saine,reference being had to the aeY companying drawings, forming a part ofthis specification, in which- Figure l represents a side view of apulley applied to its shaft. Fig. 2 represents a longitudinal centralsection on line A B, Fig. 1. Fig. 3 represents a cross-section of one ofthe friction-arms, looking in the direction of the arrow 2; and Fig. trepresents a similar view of the other end of the same friction-arm,looking in the direction of arrow 3.

To enable those skilled in the art to make and use my invention, I willproceed to describe it.

In the drawings, Arepresents the shaft, upon which is placed theloose-pulley B and the friction-lever frame C, the latter being fastenedto shaftA,in this instance,by a set-screw, a. (Seen in dot-ted lines inFig. 2.)

Frame C has two projecting arms, D D, each of which has a slot, b, inwhich is placed a headeil pivot-bolt, c, which supports the rear end ofa friction-lever, E, which is also pivoted at e to a slide-piece, d,which is arranged to slide up and down in a groove or slot in a flange,F, upon the friction-lever frame C.

The slide-pieces d have holes at their inner ends, through whichcam-forks ff pass, the

latter being fastened to projections or ears g g I upon theshipper-piece G, which has a groove, h, and is operated in the usualmanner by a fork or clutch lever.

The operation is as follows: Pulley B is loose upon shaft A, and is tobe driven by al belt, which is always in motion during working hours.

When it is desired to operate shaft A, and thus put in motion anymachinery connected with or driven by it, the operator forces theshipper-piece G toward pulley B, thereby forcing forks f f also in thesame direction, whereby the cam-surfaces i i cause slides d d to movetoward the periphery of wheel B, and thus bear the outer surface of thefrictionarms E against the inner surface of a part of wheel B, as shownin dark lines, Fig. 2.

As wheel B turns in the direction of arrow l, as soon as thefriction-arms E come in contact with the inner surface of the rim ofwheel B the face of the pulley has a tendency to cause arms E E toexpand and hug the rim of the wheel still closer, so that shaft A iscaused to revolve with pulley B as long as the forks f f remain in theposition shown in bla-ck lines, Fig. 2.

When, however, it is desired to stop shaft A, the operator throws theshipper-piece G back, as shown in red lines, Fig. 2, by which operationthe cam-surfaces s s of the forks ff strike against the inner surfacesof the slots in slides d d, and withdraw the slides toward shaft A, asindicated in red lines, Fig. 2.

By this movement of the parts the frictionarms E E are withdrawn fromcontact with pulley B, and shaft A stops.

In this instance a leather covering,`6, is applied to the outer surfaceof the arms E; but, if desired, they can be used without such covering.

Again, in the drawings, plates j j are screwed on to hold slides d d inplace in the slots in flange F 5 but the liange might be cast whole andcored out, so as to obviate the necessity of screws or extra plates.

The friction-lever frame C might be cast with a ange to extend in overthe hub 7 of wheel B, and thus give the ends of forks f f a support asthey are moved back and forth.

If at any time it is desirable to have the friction-levers E E thrownfarther out nut 8 is loosened and bolt c moved in slot b toward shaft Athe proper distance, after which nut 8 is screwed up again. Y

It will thus be seen that this friction device can b easily adj usted tocompensate for any wear of the parts.

The device is simple in construction, not liable to get out of order,and thus obviates many of the objections to the various frictionpulleysnow in use.

One or more friction arms or levers E may v each pulley.

be 'employed to operate in connection with 2. Making flange F with slotsto receive the slides d, iu combination with providing Having describedmy improved frietiouarms D With slots b, for the purposes stated.

pulley, what I claim therein as new, and desire to secure by LettersPatent, is- L; G. MASON.

1. The combination of a hinged frictionlever7 E, with the slide d, framec, und shipper- Witnesses:

.piece G, with a, cam-fork, f, substantially as THOS.H. DODGE,

and. for the purpose set forth. D. L. MILLER.

